Deep Ocean Wings include the Retraction Band System, which is designed to keep the wing folded behind the diver&';s shoulders, reducing drag and the chance of entanglement. Works with single or twin cylinders. Interior retraction band system Lift capacity: 48-60 lbs (21.7-27 kg) New style configuration 16 Inflator hose on the left shoulder Power inflator hose included Interior zipper backing Dump valve on the lower left Dump valve on the upper right Stainless steel grommets 1000 denier nylon outer bag Interior urethane backing protects against abrasions and punctures Inner bladder polyurethane material, ultrasonically welded fittings and seams Low pressure (LP) inflation hose included Double stitched seams to prevent fraying Donut style configuration for optimum air movement in any position